斜切对抑制引射式波瓣喷管内部流动分离的效果研究

 为了了解大扩张波瓣流动分离及其控制方法,对引射式波瓣混合器的扩张角与波瓣内部流动分离的关系进行了研究,得到了引射式波瓣混合器出现分离的临界瓣角,进而提出了对存在流动分离的波瓣喷管进行斜切处理的方法,有效地抑制了引射式大扩张角波瓣喷管主流侧瓣顶内存在的流动分离现象,同时还对斜切波瓣与存在流动分离的基准波瓣喷管的引射系数和波瓣出口处的总压损失进行了研究。总的来看,对于存在主流侧流动分离的引射式大瓣角波瓣喷管而言,斜切处理一种是提高其引射效果、降低流动损失的合理方案。

Research on Surpressing Flow Separation of Lobed Mixer-ejector by Scarfing Treatment

To investigate flow separation inside lobed mixer-ejector and the way to control it, the relationship between lobed angle and flow separation inside lobed mixer-ejector has been revealed. To control the flow separation inside a lobed mixer-ejector with a big lobed angle, scarfing treatment is tried to study its effectiveness in eliminating separation bubbles inside the lobed mixer-ejector by numerical simulation. Results show that scarfing treatment does eliminate the separation bubbles inside the mixer-ejector, hence enhancing nozzle ejecting ratio and reducing total pressure loss. Therefore a conclusion can be drawn that for a lobed mixer-ejector, scarfing the nozzle is a proper way to control flow separation inside lobed mixer-ejectors.